CN209977098U - Hydraulic braking clamp - Google Patents
Hydraulic braking clamp Download PDFInfo
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- CN209977098U CN209977098U CN201920318682.9U CN201920318682U CN209977098U CN 209977098 U CN209977098 U CN 209977098U CN 201920318682 U CN201920318682 U CN 201920318682U CN 209977098 U CN209977098 U CN 209977098U
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Abstract
The utility model relates to a hydraulic braking clamp belongs to rail vehicle technical field. The hydraulic brake clamp comprises a base, a push rod, a stress block and a manual mechanical release locking device, wherein the push rod, the stress block and the manual mechanical release locking device are arranged on the base; the braking force output end part of the push rod is provided with a rotating torque receiving part; the stress block is provided with a relieving operation channel which penetrates from the outer end side to the exposed rotating torque receiving part; the manual mechanical release locking device comprises an anti-rotation part detachably sleeved in the release operation channel and a retaining mechanism used for releasably retaining the anti-rotation part in the release operation channel; a first anti-rotation mechanism for preventing the operation channel and the anti-rotation piece from rotating relatively is distributed between the operation channel and the anti-rotation piece; a second anti-rotation mechanism for preventing the anti-rotation piece and the push rod from rotating relatively is arranged between the anti-rotation piece and the push rod. The hydraulic braking clamp based on the structure is convenient for manual mechanical relieving operation, and can be widely applied to the manufacturing field of rail vehicles and the like.
Description
Technical Field
The utility model relates to an equipment for rail vehicle, specifically speaking relates to a hydraulic braking clamp of institutional advancement.
Background
The hydraulic brake clamp is used as a basic brake component on an urban rail transit vehicle, and the common structure of the hydraulic brake clamp is shown in fig. 7, and comprises a base 01, a push rod 02, a brake spring 03, a piston 04, a stress block (not shown in the figure), a lever 05, a brake pad 061, a brake pad 062 and a brake disc 07; a piston cavity 010 is arranged on the base 01, the fulcrum of the lever 05 is hinged on the base 01 through a hinge shaft 08, and a power arm of the lever is connected to the push rod 02 in a relatively rotatable manner through a stress block; the piston 04 is reciprocally disposed in the piston chamber 010, and a brake spring 03 for moving the push rod 02 is installed in the piston chamber 010.
In the working process, when the piston cavity 010 is decompressed through the oil hole 011, under the action of the elastic restoring force of the brake spring 03, the brake disc 07 is clamped by pushing the brake pad 061 to be matched with the brake pad 062 through the lever 05 under the transmission action of the push rod 02 and the stressed block, so that braking is realized; when the piston cavity 010 is pressurized through the oil hole 011 communicated with the piston cavity, the hydraulic pressure pushes the relieving piston 04 to overcome the elastic restoring force of the brake spring 03 and push the brake pads 061 and 062 to be separated from the brake disc 07, so that relieving is realized, normal driving can be carried out, namely, the hydraulic unit is controlled to pressurize the brake clamp, and relieving is generated.
In addition to the above-mentioned relief of charging by controlling the hydraulic unit, there are two ways of relief: (1) an auxiliary device independent of the hydraulic unit is used for generating hydraulic pressure to relieve the clamp; (2) manual mitigation is performed by a mechanical mitigation mechanism of the brake caliper itself.
For the manual relieving mode through a mechanical structure, usually, the push rod 02 is rotated, firstly, the gaps between the brake pads 061 and 062 and the brake disc 07 can be adjusted after the brake pads are replaced, and secondly, the brake can be relieved manually and mechanically after the hydraulic system fails, so that rescue is implemented. The push rod within the component must have a mechanism to prevent rotation during normal use. However, the manual release mechanism of the existing structure is arranged on the other side of the output force of the push rod, namely, on one side of the brake disc 07 departing from the lever 05, when the manual release mechanism is installed on a vehicle, the manual release mechanism is installed on the inner side of the vehicle body, the observation is inconvenient, two locking bolts and an anti-rotation piece need to be detached when the manual release mechanism is used, and the operation is inconvenient.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims at providing a hydraulic braking clamp to the operation is alleviated to the manual machine.
In order to achieve the main purpose, the hydraulic brake clamp provided by the utility model comprises a base, a push rod, a stress block and a manual mechanical release locking device, wherein the push rod, the stress block and the manual mechanical release locking device are arranged on the base; the braking force output end part of the push rod is provided with a rotating torque receiving part which is used for receiving a rotating torque capable of driving the push rod to rotate; the stress block is provided with a relieving operation channel which penetrates from the outer end side to the exposed rotating torque receiving part; the manual mechanical release locking device comprises an anti-rotation part detachably sleeved in the release operation channel and a retaining mechanism used for releasably retaining the anti-rotation part in the release operation channel; a first anti-rotation mechanism for preventing the operation channel and the anti-rotation piece from rotating relatively is distributed between the operation channel and the anti-rotation piece; a second anti-rotation mechanism for preventing the anti-rotation piece and the push rod from rotating relatively is arranged between the anti-rotation piece and the push rod.
The torque moment receiving part capable of driving the push rod to rotate to relieve operation is arranged on one side of the braking force output end part of the push rod, so that observation and rapid manual mechanical relieving operation can be facilitated.
The specific scheme is that the relief operation channel is an operation through hole with a non-circular cross section, and the anti-rotation piece is a non-cylinder of which the outer peripheral surface can abut against the hole wall of the operation through hole to prevent rotation; the first rotation-preventing mechanism comprises an outer peripheral surface and a hole wall which are abutted against each other and prevent rotation. The non-circular hole is matched with the non-circular rod to serve as an anti-rotation structure, so that the structure is simple and quick assembly and disassembly are convenient.
More specifically, the operation through hole is a waist circular hole or an elliptical hole, and the non-cylindrical body is matched with the operation through hole.
The other more specific scheme is that the rotating torque receiving part is a non-circular rod part on the push rod, and the non-circular rod part is the outer end part of the push rod; the anti-rotation part is provided with a non-circular hole sleeved on the non-circular rod part, and the second anti-rotation mechanism comprises an outer peripheral surface of the non-circular rod part which is abutted against and prevented from rotating and a hole wall of the non-circular hole. The rotating moment is set to be a non-circular rod part and is positioned on the outer end part of the push rod, so that the operation of applying the rotating moment is facilitated; and the rotation-preventing mechanism is constructed by utilizing the matching of the non-circular rod and the non-circular hole, so that the integral structure can be simplified, and the quick assembly and disassembly are convenient.
Another specific scheme is that the rotating torque receiving part is a non-circular rod part on the push rod. The structure of the rotation torque receiving part is simplified.
More specifically, the anti-rotation part is provided with a non-circular hole sleeved on the non-circular rod part, and the second anti-rotation mechanism comprises an outer peripheral surface of the non-circular rod part which is abutted against and prevented from rotating and a hole wall of the non-circular hole. The non-circular hole is matched with the non-circular rod to serve as an anti-rotation structure, so that the structure is simple and quick assembly and disassembly are convenient.
Another more specific scheme is that the non-circular rod part is the outer end part of the push rod; the non-circular rod part is of an outer polygonal rod part structure. The driving torque receiving part is provided with an outer hexagonal rod part structure, an outer pentagonal rod part structure and the like, so that the rotation operation of relieving by using the existing tool is facilitated.
The preferable scheme is that a clamping groove which is circumferentially arranged around an anti-rotation piece is concavely formed on the side wall of the outer end part of the relieving operation channel; more than two mounting notches penetrating to the outer end face of the stress block and more than two stopping grooves are formed in the clamping groove; the holding mechanism comprises a rotary table which is relatively rotatably connected with the outer end part of the anti-rotating part, more than two clamping lug seats are convexly and fixedly arranged on the outer peripheral edge of the rotary table, and at least one clamping lug seat is provided with an elastic plunger piston; a rotating torque receiving part is arranged on the outer end face of the turntable; more than two clamping lug seats can be clamped into the clamping groove through the mounting notch; when the rotating disc rotates to a holding position relative to the anti-rotating part, the end part of at least one elastic plunger piston can be retractably embedded into the stopping groove and clamped in the clamping lug seats in the clamping groove, the central angle of two adjacent clamping lug seats relative to the rotating axis is smaller than or equal to 90 degrees, and the rotating axis is the rotating axis of the rotating disc relative to the anti-rotating part. The locking operation is not required to be carried out by bolts, so that the quick assembly and disassembly are convenient.
The more preferable proposal is that an elastic reset piece which forces the distance between the rotating disc and the anti-rotating piece to increase is pressed between the rotating disc and the anti-rotating piece; the turntable is a disc, and the outer end part of the relieving operation channel is a circular hole part matched with the disc.
The further proposal is that the elastic reset piece is a disk spring; the bottom surface of the clamping groove is a circumferential surface; the outer end face of the anti-rotating piece is concavely provided with a disk spring mounting groove, the central area of the disk spring mounting groove is provided with a mounting round hole, and the inner surface of the rotary disk is convexly and fixedly provided with a rotating shaft which is rotatably sleeved in the mounting round hole; the rotating torque receiving part is a non-cylindrical structure fixedly arranged at the central area of the turntable.
Drawings
Fig. 1 is a perspective view of an embodiment of the present invention;
fig. 2 is a partial structural sectional view of an embodiment of the present invention;
FIG. 3 is a diagram of the embodiment of the present invention, showing the structure of the force-receiving block, the push rod and the locking device for alleviating manual operation;
FIG. 4 is an enlarged view of a portion of the structure of the force-receiving block, the push rod and the locking device for manual mechanical release according to an embodiment of the present invention;
FIG. 5 is an exploded view of the embodiment of the present invention after omitting the belleville spring;
fig. 6 is a perspective view of a manual mechanical release locking device in an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a conventional hydraulic brake caliper.
Detailed Description
The present invention will be further described with reference to the following examples and accompanying drawings.
The utility model discloses a main objective is to improve the structure of the device is alleviated to the manual machinery in the hydraulic braking clamp, in the following embodiment, mainly carry out the exemplary description to the structure that the device was alleviated to the manual machinery, designs with reference to the structure of current product to the structure of other part mechanisms in the hydraulic braking clamp.
Examples
Referring to fig. 1 to 6, the hydraulic brake caliper 1 of the present invention includes a base 10, and a push rod 2, a force-receiving block 3, a lever 11, a brake pad 12 and a manual mechanical release locking device installed on the base 10.
As shown in fig. 3, the push rod 2 includes a screw portion 20 and an outer hexagonal rod portion 22 disposed on the braking force output end side thereof, and the outer hexagonal rod portion 22 constitutes a rotation torque receiving portion on the push rod 2 so as to be capable of being driven to rotate by an inner hexagonal wrench, thereby adjusting the positional relationship between the brake pads 12 and a brake disk (not shown), that is, the outer hexagonal rod portion 22 is configured to receive a rotation torque capable of driving the push rod 2 to rotate, so as to perform a manual mechanical relief operation, and the like.
As shown in fig. 3 to 6, a relief operation passage 30 is provided on the force receiving block 3 so as to penetrate from the outer end side thereof to the position where the outer hexagonal rod portion 22 is exposed, and in the present embodiment, the relief operation passage 30 is an operation through hole of a through hole structure, specifically, a waisted hole structure in cross section, that is, two side plane hole wall portions 300 arranged in parallel thereon.
As shown in fig. 1 to 6, the manual mechanical relief locking device includes an anti-rotation member 4 detachably fitted in the relief operation passage 30, and a holding mechanism for releasably holding the anti-rotation member 4 in the relief operation passage 30; and a first anti-rotation mechanism is arranged between the relieving operation channel 30 and the anti-rotation piece 4 and used for preventing the anti-rotation piece 4 from relatively relieving the operation channel 30 from rotating, namely, the anti-rotation piece 4 and the stress block 3 from relatively rotating, and a second anti-rotation mechanism is arranged between the anti-rotation piece 4 and the push rod 2 and used for preventing the push rod 2 from relatively preventing the anti-rotation piece 4 from rotating, namely, under the combined action of the first anti-rotation mechanism and the second anti-rotation mechanism, the push rod 2 can be prevented from rotating relative to the stress block 3, so that the normal work under the conventional condition is ensured, and when the relieving is needed manually under the emergency condition, the anti-rotation piece 4 is disassembled, and the push rod 2 is driven to rotate by using tools such as an inner hexagonal wrench and the like, so that the manual mechanical relieving.
In the present embodiment, the anti-rotation member 4 is a cylinder structure with a non-circular cross section, the outer surface of which is adapted to the waist-hole-shaped relief operation channel 30, i.e. is a flat cylinder structure, and the outer peripheral surface of which has two side plane portions 40 arranged in parallel, so that when the two are fitted together, the two side plane portions 40 can abut against the two side plane hole wall portions 300 to prevent the two from rotating relatively, i.e. in the present embodiment, the first anti-rotation mechanism includes the two side plane portions 40 and the hole wall portions 300 which abut against each other to prevent rotation.
The rotation-preventing member 4 is provided with a non-circular hole inside, which is open and arranged toward the push rod 2, specifically, in the present embodiment, the non-circular hole is a circular hole 41, when the circular hole 41 is sleeved outside the outer hexagonal rod portion 22, the two side plane portions 220 on the outer circumferential surface of the outer hexagonal rod portion 22 abut against the two side plane hole wall portions 410 on the circular hole 41 to prevent the two from rotating relatively, that is, in the present embodiment, the second rotation-preventing mechanism includes the two side plane portions 220 and the hole wall portions 410 which abut against each other to prevent rotation.
A clamping groove 31 which is arranged around the circumferential direction of the anti-rotation piece 4 is concavely formed on the side wall of the outer end part of the relieving operation channel 30; the locking groove 31 is provided with more than two mounting notches 32 penetrating to the outer end face of the force bearing block 3 and more than two stopping grooves 33.
The retaining mechanism comprises a rotary disc 5 which is connected with the outer end part of the anti-rotating part 4 in a relatively rotating mode, specifically, a disc spring mounting groove 43 is concavely arranged in the outer end surface of the anti-rotating part 4, and a mounting circular hole 44 is arranged in the central area of the disc spring mounting groove 43; the rotating disc 5 is a disc structure, and a rotating shaft 50 rotatably sleeved in the mounting circular hole 44 is convexly fixed on the inner surface of the rotating disc 5, that is, the rotating disc 5 can rotate around the central axis 500 of the rotating shaft 50 relative to the rotation preventing member 4. And a non-cylindrical structure 51 is fixedly arranged at the central area of the outer disc surface of the rotating disc 5, in this embodiment, the non-cylindrical structure 51 is an outer hexagonal cylinder structure, so that the rotating disc 5 is driven to rotate relative to the anti-rotation member 4 by an inner hexagonal wrench, that is, the cylindrical structure constitutes a rotating torque receiving portion for driving the rotating disc 5 to rotate relative to the anti-rotation member 4 in this embodiment. At 50 covers of axis of rotation and be equipped with the belleville spring 16 of arranging in belleville spring mounting groove 43, and with the belleville spring 16 suit at axis of rotation 50, reuse set screw 82, locate the cooperation of preventing the installation round hole 44 on the rotating member 4 and locating the screw 508 of axis of rotation 50 and carry out fixed connection, compress and produce the pretightning force to belleville spring 16, belleville spring 16 constitutes to press in carousel 5 and prevent rotating between the member 4 promptly, and be used for forcing the elasticity piece that resets that the interval between the two increases, of course, this elasticity piece that resets can adopt compression spring and homopolar two magnet pieces of arranging relatively to establish.
More than two clamping lug seats 52 are convexly and fixedly arranged on the outer periphery of the rotary disc 5, and each clamping lug seat is provided with an elastic plunger 53. In the present embodiment, the number of the clamping lug seats 52, the stopping groove 33 and the mounting notch 32 is two, and the two mounting notches 32, the two clamping lug seats 52, the two elastic plungers 53 and the two stopping grooves 33 are all arranged approximately symmetrically with respect to the central axis 500, i.e. the central angle of the two adjacent clamping lug seats 52 with respect to the rotation axis 500 is equal to 90 degrees. The outer end 303 of the relief operation passage 30 is a circular hole portion adapted to the outer periphery of the turntable 5, and the bottom surface 310 of the notch 31 is a circumferential surface. The rotation prevention function is achieved by the cooperation of the elastic plunger 53 and the stopper groove 33.
In the using process, the anti-rotation part 4 is sleeved in the relieving operation channel 30, the outer hexagonal rod part 22 is sleeved in the waist circular hole 41, and the two clamping lug seats 52 are aligned to the installation gap 32, so that all the clamping lug seats 52 can be clamped in the clamping groove 31; when the rotating disc 5 rotates to the holding position relative to the anti-rotation part 4, at this time, the relative position is as shown in fig. 4, the end parts of the two elastic plungers 53 are retractably embedded into the stopping grooves 33, and the two clamping lug seats 52 are clamped in the clamping grooves 31; when mechanical relieving operation is required or the position relationship between a new brake pad and a brake disc is adjusted, the inner hexagonal wrench is used for driving the rotary disc 5 to rotate around the central axis 500 relative to the anti-rotation piece 4 through the non-cylindrical structure 51 so as to drive the end part of the elastic plunger 53 to withdraw from the stopping groove 33, and rotate to the mounting lug seat 52 at the mounting notch 32, the anti-rotation piece 4 is taken out, the inner hexagonal wrench is used for driving the push rod 2 to rotate, so that the position relationship between the brake pad and the brake disc is adjusted, and manual mechanical relieving operation is achieved; namely, the retaining mechanism serves to releasably retain the rotation preventing member 4 in the relief operation passage 30. The turntable 5 is provided with a safety rope which is hung on the part after being dismounted so as not to be lost.
In the embodiment, the manual mechanical release locking device and the position setting thereof based on the structure setting have the following advantages: (1) the bolt is not required to be used for locking, so that the risk of falling off due to loosening of the bolt is reduced; (2) under the condition that a hydraulic system fails, quick manual relief and quick rescue are realized; (3) manual relief can be achieved with only one tool; (4) the waist-round hole structure is adopted to limit the outer hexagonal rod part, so that the up-and-down sliding can be realized, and the relative rotation between the waist-round hole structure and the outer hexagonal rod part can be limited, so that the rapid dismounting can be better carried out.
In the above embodiment, the rotating torque receiving portion is a non-circular rod portion, specifically an outer hexagonal rod portion, provided on the push rod 2, and is an outer end portion of the push rod 2; of course, other non-round rod configurations are possible, such as oval cross-sections or oblate rods that fit into a kidney hole. The rotation-preventing member 4 has a non-circular hole, specifically a oval hole structure, which is sleeved on the non-circular rod portion, and of course, may also be set to an inner polygonal hole structure such as an inner hexagonal hole or an elliptical hole structure whose cross section is elliptical. To alleviating the cross section structure of operation passageway, also similar, be non-circular through-hole structure, not be restricted to oval hole structure, still can be oval hole or interior hexagonal hole structure etc. also the same to the outer peripheral face structure of rotating-proof piece 4, can adopt multiple non-circular structure to set up.
The main idea of the utility model is to relieve the operating position setting through the machinery that will order about the push rod pivoted and be located the hydraulic braking clamp outside department, and be convenient for observe the operation. There are many obvious variations of the structure of the retaining mechanism according to the present concept, and not limited to the specific structure of the above embodiments, for example, a cover plate that snaps onto the force-receiving block with a snap-fit structure.
Claims (10)
1. A hydraulic brake clamp comprises a base, a push rod, a stress block and a manual mechanical release locking device, wherein the push rod, the stress block and the manual mechanical release locking device are installed on the base; the method is characterized in that:
the braking force output end part of the push rod is provided with a rotating torque receiving part which is used for receiving a rotating torque capable of driving the push rod to rotate; the stress block is provided with a relieving operation channel which penetrates from the outer end side of the stress block to expose the rotating torque receiving part;
the manual mechanical release locking device comprises an anti-rotation part detachably sleeved in the release operation channel and a retaining mechanism used for releasably retaining the anti-rotation part in the release operation channel; a first anti-rotation mechanism for preventing the operation channel and the anti-rotation piece from rotating relatively is arranged between the operation channel and the anti-rotation piece; and a second anti-rotation mechanism for preventing the anti-rotation piece and the push rod from rotating relatively is arranged between the anti-rotation piece and the push rod.
2. The hydraulic brake caliper of claim 1, wherein:
the operation relieving channel is an operation through hole with a non-circular cross section, and the anti-rotation part is a non-cylindrical body of which the outer peripheral surface can abut against the hole wall of the operation through hole to prevent rotation; the first anti-rotation mechanism comprises the outer peripheral surface and the hole wall which are abutted to each other to prevent rotation.
3. The hydraulic brake caliper of claim 2, wherein:
the operation through-hole is waist round hole or elliptical hole, non-cylinder with operation through-hole looks adaptation.
4. The hydraulic brake caliper of claim 2, wherein:
the rotating torque receiving part is a non-circular rod part on the push rod, and the non-circular rod part is the outer end part of the push rod; the anti-rotation part is provided with a non-circular hole sleeved on the non-circular rod part, and the second anti-rotation mechanism comprises an outer peripheral surface of the non-circular rod part and a hole wall of the non-circular hole, wherein the outer peripheral surface of the non-circular rod part abuts against the hole wall of the non-circular hole to prevent rotation.
5. The hydraulic brake caliper of claim 1, wherein:
the rotating moment receiving part is a non-circular rod part on the push rod.
6. The hydraulic brake caliper of claim 5, wherein:
the anti-rotation part is provided with a non-circular hole sleeved on the non-circular rod part, and the second anti-rotation mechanism comprises an outer peripheral surface of the non-circular rod part and a hole wall of the non-circular hole, wherein the outer peripheral surface of the non-circular rod part abuts against the hole wall of the non-circular hole to prevent rotation.
7. The hydraulic brake caliper of claim 5, wherein:
the non-circular rod part is the outer end part of the push rod;
the non-circular rod part is of an outer polygonal rod part structure.
8. The hydraulic brake caliper according to any one of claims 1 to 7, wherein:
a clamping groove which is circumferentially arranged around the anti-rotation piece is concavely formed on the side wall of the outer end part of the relieving operation channel; more than two mounting notches penetrating to the outer end face of the stress block and more than two stopping grooves are formed in the clamping groove;
the holding mechanism comprises a rotary disc which can be relatively and rotatably connected with the outer end part of the anti-rotating part, more than two clamping lug seats are convexly and fixedly arranged on the outer peripheral edge of the rotary disc, and an elastic plunger is arranged on at least one clamping lug seat; a rotating torque receiving part is arranged on the outer end face of the turntable;
the more than two clamping lug seats can be clamped into the clamping groove through the mounting notch; when the rotating disc rotates to a holding position relative to the anti-rotating part, the end part of at least one elastic plunger piston can be retractably embedded into the stopping groove, and for a plurality of clamping lug seats clamped in the clamping grooves, the central angle of two adjacent clamping lug seats relative to the rotating axis is less than or equal to 90 degrees, and the rotating axis is the axis of the rotating disc relative to the anti-rotating part.
9. The hydraulic brake caliper of claim 8, wherein:
an elastic reset piece for forcing the distance between the rotating disc and the anti-rotating piece to increase is pressed between the rotating disc and the anti-rotating piece; the rotary disc is a disc, and the outer end part of the relieving operation channel is a circular hole part matched with the disc.
10. The hydraulic brake caliper of claim 9, wherein:
the elastic reset piece is a disc spring; the bottom surface of the clamping groove is a circumferential surface; a disk spring mounting groove is concavely arranged in the outer end face of the anti-rotating piece, a mounting round hole is arranged in the central area of the disk spring mounting groove, and a rotating shaft which is rotatably sleeved in the mounting round hole is convexly and fixedly arranged on the inner surface of the rotating disk; the rotating torque receiving part is a non-cylindrical structure fixedly arranged in the central area of the rotary disc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920318682.9U CN209977098U (en) | 2019-03-13 | 2019-03-13 | Hydraulic braking clamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920318682.9U CN209977098U (en) | 2019-03-13 | 2019-03-13 | Hydraulic braking clamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209977098U true CN209977098U (en) | 2020-01-21 |
Family
ID=69254399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920318682.9U Active CN209977098U (en) | 2019-03-13 | 2019-03-13 | Hydraulic braking clamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209977098U (en) |
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2019
- 2019-03-13 CN CN201920318682.9U patent/CN209977098U/en active Active
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